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diff --git a/libsolidity/ConstantEvaluator.h b/libsolidity/ConstantEvaluator.h
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+/*
+	This file is part of cpp-ethereum.
+
+	cpp-ethereum is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	cpp-ethereum is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/**
+ * @author Christian <c@ethdev.com>
+ * @date 2015
+ * Evaluator for types of constant expressions.
+ */
+
+#pragma once
+
+#include <libsolidity/ASTVisitor.h>
+
+namespace dev
+{
+namespace solidity
+{
+
+class TypeChecker;
+
+/**
+ * Small drop-in replacement for TypeChecker to evaluate simple expressions of integer constants.
+ */
+class ConstantEvaluator: private ASTConstVisitor
+{
+public:
+	ConstantEvaluator(Expression const& _expr) { _expr.accept(*this); }
+
+private:
+	virtual void endVisit(BinaryOperation const& _operation);
+	virtual void endVisit(UnaryOperation const& _operation);
+	virtual void endVisit(Literal const& _literal);
+
+};
+
+}
+}